What is the CVSS score of CVE-2021-47918?

CVE-2021-47918 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of PHP are affected by CVE-2021-47918?

Simple CMS 2.1 deployments face a critical SQL injection risk that allows authenticated administrators to compromise the entire database and application.

Is there a public PoC exploit available for CVE-2021-47918?

Yes, a public proof-of-concept exploit is available for CVE-2021-47918. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47918?

Within 24 hours: Inventory all systems running Simple CMS 2.1 and restrict admin.php access to trusted networks only. Within 7 days: Deploy Web Application Firewall rules to block SQL injection patterns in the users module and implement input validation at the application layer. Within 30 days: Evaluate migration to a patched CMS version or establish a compensating control roadmap if migration is infeasible.

PHP CVE-2021-47918

HIGH

SQL Injection (CWE-89)

2026-02-01 disclosure@vulncheck.com

PHP SQLi Simple Cms Php Simplephpscripts

8.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.1 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:01 vuln.today

PoC Detected

Feb 11, 2026 - 19:30 vuln.today

Public exploit code

CVE Published

Feb 01, 2026 - 13:15 nvd

HIGH 8.1

DescriptionCVE.org

Simple CMS 2.1 contains a remote SQL injection vulnerability that allows privileged attackers to inject unfiltered SQL commands in the users module. Attackers can exploit unvalidated input parameters in the admin.php file to compromise the database management system and web application.

AnalysisAI

Technical ContextAI

Classified as CWE-89 (SQL Injection). Affects the users component of Simple Cms Php. Simple CMS 2.1 contains a remote SQL injection vulnerability that allows privileged attackers to inject unfiltered SQL commands in the users module. Attackers can exploit unvalidated input parameters in the admin.php file to compromise the database management system and web application.

RemediationAI

Monitor vendor advisories for a patch. Use parameterized queries. Implement input validation. Restrict network access to the affected service where possible.